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Low pressure rise rate pilot operated poppet relief valve

a technology of low pressure rise rate and poppet, which is applied in the direction of valve operating means/releasing devices, functional valve types, valves, etc., can solve the problems of adding to manufacturing costs, direct-acting poppet valves have a tendency to be unstable, and traditional pilot operation combined with a poppet is unstabl

Active Publication Date: 2013-01-29
DANFOSS POWER SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a new type of poppet relief valve that improves control and reduces instability. The technical effects of this innovation are better performance and more stable operation of the valve.

Problems solved by technology

Direct acting poppet valves have a tendency to be unstable unless a very high rate spring or special geometry is used.
Attempts have been made to met this need; however, typically a traditional style pilot operation combined with a poppet is unstable.
Additional problems exist with complex machining needed to accomplish the combination thus adding to manufacturing costs.

Method used

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  • Low pressure rise rate pilot operated poppet relief valve
  • Low pressure rise rate pilot operated poppet relief valve
  • Low pressure rise rate pilot operated poppet relief valve

Examples

Experimental program
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Embodiment Construction

[0011]The figures show a relief valve 10. The relief valve 10 comprises a poppet housing 12 with a centrally located cavity 14 in fluid communication with a valve inlet 16 at a first end and a fluid outlet 18 adjacent the cavity 14 to provide fluid flow communication with a tank (not shown). Adjacent the inlet 16 within the cavity 14 is a first area 20 wherein the inlet 16 provides pressure. The poppet housing additionally has a poppet seat 21 therein for receiving a poppet 22.

[0012]Disposed within the cavity 14 is poppet 22 and a pilot 24 wherein the first end of the pilot matingly and detachably connects to the poppet 22 within cavity 14 as shown in FIGS. 1-3. The second end of the pilot forms a pilot seat 26 having a milled flat. A second area 28 is disposed between the poppet and pilot 22, 24 within cavity 14 of the poppet housing. The poppet 22 additionally has a cavity 30 disposed therein that extends the distance of the poppet 22. Similarly the pilot 24 has a cavity 31 dispos...

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Abstract

A relief valve for a hydraulic machine that combines a poppet valve assembly and a pilot valve assembly together using a connector pin wherein internal fluid passageways within the poppet and pilot spools provide a fluid flow path between the inlet of the valve and a cavity disposed between the poppet and pilot. As a result of the internal passageways fluid is metered to the interior cavity to provide additional control and stability within the relief valve.

Description

BACKGROUND OF THE INVENTION[0001]This invention relates to hydraulic devices. More specifically this invention relates to a relief valve for a hydraulic device.[0002]Traditionally, low leakage relief valves utilize a direct acting poppet and low pressure rise rate valves are pilot operated. Direct acting poppet valves have a tendency to be unstable unless a very high rate spring or special geometry is used. The use of a high rate spring increases the pressure rise rate proportionately. Thus, there is a need to combine a poppet with a pilot to have functioning of both within a valve at a low cost. Attempts have been made to met this need; however, typically a traditional style pilot operation combined with a poppet is unstable. Additional problems exist with complex machining needed to accomplish the combination thus adding to manufacturing costs.[0003]Therefore, a principal object of the present invention is to provide a poppet relief valve that improves control of the valve.[0004]A...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F16K31/122
CPCF16K15/044Y10T137/7758Y10T137/7762Y10T137/7769
Inventor COURTRIGHT, DENNIS O.SONCINI, ENZODAVOLI, DAVIDE I.
Owner DANFOSS POWER SOLUTIONS INC
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